Improved vise



.corresponding parts ofthe invent-ion.

' waitedv Sastre @anni Gettin.

Letters Patent No. 98,040, dated .Decembec` 2l, 1869.

IMPROVE-in vxsn.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern Be it known thatv we, EDWlN CRAWLEY and THOMAS L. BAYLIES, of Richmond, in the county of Wayne, and State of Indiana, have invented n'ew and useful Improvements in Automatic Vises; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Fignre l is a longitudinal vertical section, the parts heiugshown in the positions they assume when thc jaws are not gripping an article.

Figure 2 is a horizontal section, through the middle. of the vise, the parts heilig shown in the positions they assume when the jaws are gripping an article.

Figure 3 is a transverse vertical section, through the dotted line :t x.

The same letters in the different figures refer to Our invention relates to an improvement in automatic vises, or that classof vises, the moving jaw of which has a rapid motion when being adjusted, with reference to the article to be secured therein, but

which motion is automatically.changed to a slower one, giving increased force, when said jaw comes in contact with the thing to be held.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

With reference to the drawings- Gis a bed-plate, and A and B are jaws, the former being movable, and the latter stationary,` on bedplate G.

O represents a box-slide, passing through a eorre,

sponding rectangular opening in jaw B, to which boxslide, ja\ v A is connected, and by which it`is maintained in its propel position witltreference to jaw B.

E represents a shaft, which is` provided with screwthreads on a part of its length, which threads engage with correspondingthreads in nut H. Said threads have a coarser or more rapid pitch than those ordinarily used in vises.

Nut H is secured to hed;plate G by screws, or by means of dovetailed projections formed upon said bedplate.

The end of shaft E, which projects beyond the front face of jaw A, is provided with a boss, F, through an orifice in which, a lever, L, is inserted, by means of which shaft E is operated.

I Ifrepresent two cam-wheels, placed in a recess formed in jaw A, said wheels being opposite to cach other, with shaft E passing between them.

q q represent axles or shafts, 011 which cam-wheels I l' revolve. The. outer ends of said axles rest in slots iormed in the sides of jaw A, the inner ends being secured to collar h, which collar embraces shaftE, but permits said shaft to move freely therein.

Each of the cam-wheels I I is so formed that the dista-nce from the centre to the circumference of the same increases from a given point on the periphery thereof throughout the entire. circumference. The inclination or pitch thus given to the peripheries of said cam-wheels is less than the pitch of the threads on shaft E, when said wheels and shaft are revolved conjointly.

a u are coiled springs, enclosed in annular recesses formed in the outer faces of the webs of wheels I l'. One end f each of said springs is connected to its respective wheel Vat a point near the periphery thereof, the opposite end of said spring being secured to the shaft on which said wheel revolves.

t represents a pin secured in the recess ofca1n-\vheel I, at such a point as will canse said pinto come in contact, at certain times, as will be hereinafter eX- plained, with the stein of spring a, by which means said cam-wheel is prevented from revolving beyond a certain point. The same arrangement of parts explained above is used in cam-wheel I. v

c is a spiral spring, embracingshaft E. One end of said spring extends into an annular recess formed in boss F; the opposite end ot said spring hears against the front face of collar 71..

c is a plate, secured to the front face of jaw A by means of screws, and covers the recess formed in said jaw. Said plate is provided with an orifice, into which boss F extends.

l l) is aplate, secured to projection i on jaw A. 'Ihe lower portion of said plate extends into a depression formed around the periphery of boss F.

The operation of the mechanism is as follows:

The parts being in the position shown in fig. 1, the vise is ready for the reception of the article to beheld. The shaft E is turned in the proper direction, by means of lever L. When' no greater resistance is offered to the closing jaw than occurs in adjusting said jaw, the tension of spring c is suliicient to prevent boss F from coming in contact with the peripheries lot' cam-wheels I 1'; consequentlyr no rotary movement of the latter takes place, and jaw A moves with a speed corresponding lto the pitch of the threads on shaft I-n the operation of clamping the article, the press ure is produced by continuing to rotate shaft E to the right. The tirst resistance offered to the closing jaw overcomes the tension ot' spring c consequently the inner face of boss F is brought in contact with the peripheries of the camwhee1s at the point where the diameter of said wheels is greatest. As the rotary motion of shaft E is'continued, the tension of the coiled springs 'u fn' is overcome, and the said cam' wheels revolve ou the axles q q'. The result of this joint action ot" the screw and cam-wheels is to cause jaw A to -move with a speed corresponding to the difference between the pitch of the threads on shaft E and the inclination or pitch ot' the peripheries of said wheels; hence, it follows that a greater amount ot gripping force is obtained, than would be produced by the action ofthe screw alone.

\Vhen the lever L is turned to the left, for the pur pose of releasing the article the action of boss F on the peripheries of the cani-wheels causes said wheels to revolve in a direction opposite to that in which they move during the operation of compressing,r the article, until the pressure is so far removed as to permit the tension of spring c to force boss F away from the peripheries ot' the cam-wheels, when the action of the coiled springs u n continues the rotary motion of said wheels until the pins t come in contact with the stems of said springs, and thus prevent any further rotary motion of said wheels during the operation ofadjustiupr the jaw.

The relative positions of pins t, andthe stems of springs u n', are such as to *bring the cam -wheels to a state of' rest, when the highest point on the periphery ofeaeh of' said wheels is opposite the shoulder or inner face of boss F.

Plate b causes jaw A to follow the longitudinal movement of shaft E, when said shaft is turned tothe left. f

The length of the depression inthe periphery of boss F is suilicient to receive plate b, and to permity all necessary longitudinal motion of shaft E, independently of jaw A, which motion is equal tothe distance between the highest and the lowest points on the peripheries of the cani-wheels, and also the amount of lost motion between the inner face of boss F and the peripheries ot'said camwheels.

l Having thus described our invention,

lVhat we claim, and desire to secure by Letters Fatent, is-

l. The combination of boss F, spring c, and camwheels I I', witlrthe jaws, screw, and nut of a rise, substantially as set forth.

2. The combination of the cam-wheels I I, collar h, springs u aand c, and boss F, with the jaws, screw, and nut of' a vise, substantially as described.

3. The combination of the cam-wheels I l', springs Au n and c, collar h, plate b, and boss F, with the screw and movable jaw of a vise, substantially as herein described.

In testimony whereof', we have signed our names to this specification, in the presence of two subscribing witnesses.

EDWIN CRAWLEY. THOMAS L. BAYLIES.

Witnesses:

kMARTIN FOLLEN, WM. .l. BROWN. 

